#define _CRT_SECURE_NO_WARNINGS

#include <stdio.h>

int main() {
    int n = 0;
    scanf("%d", &n);
    int i = 0;
    int a = 0;
    for (i = 0; i < 4; i++)
    {
        a = n % 10;
        printf("%d", a);
        n = n / 10;
    }
    printf("\n");
    return 0;
}
